Sewing-machine for boots and shoes.



J. WfWILSON.

SEWING MACHINE FOR BOOTS AND SHOES. APPLICATION FILED JUNE 8, 1912.

1 1 1 0,024, Patentedfiept. 8, 1914.

UNTTED @TAES PATEN FFTGE.

JOSEPH WILLIAM WILSON, OF NORTHAMPTON, ENGLAND.

SEWING-MACHINE FOE BGO'IS ANT) SHOES.

To all whom it may concern Be it known that I, Josnrn VVILLIAM WIL- soN, a subject of the King of Great Britain, and resident of 27 York road, Northampton, England, have invented new and useful Improvements in Sewing-Machines for Boots and Shoes, of which the following is a specification.

In sewing machines for boots and shoes it is usual to provide a take-up for the thread and also a device for holding the thread against pulling when the stitch is being drawn tight. The take-up consists of an arm or lever swinging freely on a center and having at its extremity a pulley wheel adapted to bear against the thread on its way to the looper. A spring is provided to press or pull the take-up lever and insure that the slack of the thread shall not hang loosely when released from the tension of sewing. The thread holding device comprises a finger which grips the thread while it rests on one of its guiding rolls.

In connection with the take-up it is difiicult to provide a spring which will operateupon the lever above referred to with suffi-- cient promptitude in high speed machine; and in connection with the thread holder very accurate adjustment is necessary or the thread will be improperly held or not held at all at the right moment in quickly running machines. Various spring contrivances have been suggested for the take-up but accordin to the present invention a chain or other flexible connection is laid around the boss of the lever arm and connected to the same at one end. The opposite end is connected to a spring which imparts a direct pull on the chain thereby turning the lever on its center in the proper direction and pressing the pulley carried by the arm against the thread in the direction desired. The thread holding finger which is preferably furnished with a yielding nose is operated by a positively actuated cam lever mounted on the same shaft so that the proper adjustment of the finger on the shaft is essential. This is effected according to this invention in a very simple and accurate manner by means of a segmental rack and a worm engaging therewith. The rack is attached to the finger and the worm is carried by the structure on which the finger is pivotally mounted. The eXactitude of adj ustment of which a rack and worm or screw are capable is well understood. The adjust- Specification of Letters Patent. Application filed June 8, 1912. Serial No. 702,542.

Patented Sept. 8, 1914.

ment having been efiected the .finger is locked by clamping the socket inclosing its shaft onto the latter by means of a screw.

In the accompanying drawing I have shown a portion of a high speed sewing machine embodying the present improvements.

Figure l is a side View, Fig. 2 is a sectional plan of the thread holder adjustment detached.

0; is thread which is led in the ordinary way over and under guide pulleys Z) a (Z to the take-up which consists as usual of a stationary pulley e, an auxiliary take-up.

pulley f mounted on'a swinging arm 9 and the ordinary take-up pulley it whence the thread passes to the sewing mechanism.

In a sewing machine running at a high rate of speed it is particularly necessary that the thread should be held firmly yet lightly while each stitch is being drawn and that the auxiliary take-up should act with sufiicientpromptitude.

2' is the thread holding finger the nose of which is elastically mounted and cooperates with the pulley (Z to hold the thread against endway tension when required. The finger z is mounted on a stud or shaft 7' upon which shaft 7' is also mounted the cam lever which is actuated by the cam Z. The lever 72 is connected to the finger a by means of a segmental rack m carried by the finger 2' and a worm a engaging therewith and carried by the lever it. By means of this worm and rack connection not only is the rocking motion of the lever 70 imparted to the thread holding finger i, but the angle between the two can be adjusted with extreme accuracy according to requirement.

i a screw for clamping the finger and the lever together when the adjustment has been effected. The swing arm 9 of the takeup has connected to the boss 0 thereof, a chain 39, the opposite end of which chain is attached to the spring q and the opposite end of the spring 9 is attached to an adjustable hook carried by a bracket 1* stationary on the framework. There i thus provided a pull on the swinging arm which acts very effectively for the purpose required.

With these improvements embodied in a high speed sewing machine some of the difficulties which militate against rapidity of running have been removed.

What I claim and desire to secure by Letters Patent of the United States is In a sewing machine, a thread take-up consisting of a swinging arm and means for In testimony whereof I have signed my giving to the take-up its spring tendency in the required direction, comprising a flexible connection laid around the hub of the swinging arm and attached thereto, and a spring attached to the end of the flexible connection and to a fixed point, substantially as de scribed.

two subscribing Witnesses.

JOSEPH WILLIAM VHLSON.

Witnesses ARTHUR D. DINSDALE, ALFRED S. BISHOP.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Eatents,

Washington, D. 0.

name to this specification in the presence of 

